vb.net barcode generator Thwarting Network Reconnaissance Countermeasures in Software

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Thwarting Network Reconnaissance Countermeasures
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In this chapter, we touched on only network reconnaissance techniques You ll see more intrusive techniques in the following chapters However, several countermeasures can be employed to thwart and identify the network reconnaissance probes discussed thus far Many of the commercial network intrusion-detection systems (NIDS) and intrusionprevention systems (IPS) will detect this type of network reconnaissance In addition, one of the best free NIDS programs Snort (wwwsnortorg) by Marty Roesch can detect this activity For those who are interested in taking the offensive when someone traceroutes to you, Humble from Rhino9 developed a program called RotoRouter (http://wwwussrbackcom/UNIX/loggers/rrcgz) This utility is used to log incoming traceroute requests and generate fake responses Finally, depending on your site s security paradigm, you may be able to configure your border routers to limit ICMP and UDP traffic to specific systems, thus minimizing your exposure
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As you have seen, attackers can perform network reconnaissance or footprint your network in many different ways We have purposely limited our discussion to common tools and techniques Bear in mind, however, that new tools are released weekly, if not daily, so your fluency on this topic will depend largely on your ability to assimilate the fire hose of hacking techniques that come out Moreover, we chose a simplistic example to illustrate the concepts of footprinting Often you will be faced with a daunting task of trying to identify and footprint tens or hundreds of domains Therefore, we prefer to automate as many tasks as possible via a combination of UNIX shell and Expect or Perl scripts In addition, many attackers are well schooled in performing network reconnaissance activities without ever being discovered, and they are suitably equipped Therefore, it is important to remember to minimize the amount and types of information leaked by your Internet presence and to implement vigilant monitoring
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f footprinting is the equivalent of casing a place for information, then scanning is equivalent to knocking on the walls to find all the doors and windows During footprinting, we obtained a list of IP network blocks and IP addresses through a wide variety of techniques including whois and ARIN queries These techniques provide the security administrator (and hacker) valuable information about the target network (you), including employee names and phone numbers, IP address ranges, DNS servers, and mail servers In this chapter we will determine what systems are listening for inbound network traffic (aka alive ) and are reachable from the Internet using a variety of tools and techniques such as ping sweeps, port scans, and automated discovery tools We will also look at how you can bypass firewalls to scan systems supposedly being blocked by filtering rules Finally, we will further demonstrate how all of these activities can be done completely anonymously Now let s begin the next phase of information gathering: scanning
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DETERMINING IF THE SYSTEM IS ALIVE
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One of the most basic steps in mapping out a network is performing an automated ping sweep on a range of IP addresses and network blocks to determine if individual devices or systems are alive Ping is traditionally used to send ICMP ECHO (ICMP Type 8) packets to a target system in an attempt to elicit an ICMP ECHO_REPLY (ICMP Type 0) indicating the target system is alive Although ping is acceptable to determine the number of systems alive in a small-to-midsize network (Class C is 254 and Class B is 65,534 potential hosts), it is inefficient for larger, enterprise networks Scanning larger Class A networks (16,277,214 potential hosts) can take hours if not days to complete You must learn a number of ways for discovering live systems; the following sections present a sample of the available techniques
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